SAE-AIR-4127-2007.pdf
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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AIR4127 AEROSPACE INFORMATION REPORT Issued 2007-11 Steel: Chemical Composition and Hardenability RATIONALE AIR4127 covers methods to classify steels based on composition and hardenability, replacing AMS-STD-66 and F
5、ED- STD-66. TABLE OF CONTENTS 1. SCOPE2 2. CLASSIFICATION AND DESIGNATION OF STEELS BY CHEMICAL COMPOSITION.2 2.1 Classification.2 2.2 Standard Steels.2 2.3 Former Standard Steels2 2.4 Nonstandard Steels 2 2.5 H-Steels 2 3. VERIFICATION OF CHEMICAL COMPOSITION 3 3.1 Definitions .3 3.2 Sampling for C
6、ast or Heat Analysis3 3.3 Reporting Cast or Heat Analysis.3 3.4 Sampling for Product Analysis3 3.5 Tolerances for Product Analysis.4 4. CARBON STEEL COMPOSITIONS.4 4.1 Description4 5. STAINLESS AND HEAT-RESISTING STEEL COMPOSITIONS.4 5.1 Forms4 5.2 Description4 6. ALLOY STEEL COMPOSITIONS.4 7. STAND
7、ARD H-STEELS7 7.1 Identification7 7.2 Hardenability Bands7 FIGURE 1 DRILL LOCATIONS FOR OBTAINING PRODUCT ANALYSIS SAMPLES.7 FIGURE 2 EXAMPLES ILLUSTRATING ALTERNATE METHODS OF SPECIFYING REQUIREMENTS (TABULATED HARDNESS VALUES USED IN ORDERING)8 TABLE 1 NUMERICAL DESIGNATION OF STEELS BY COMPOSITIO
8、N .5 TABLE 2 PROCEDURES FOR OBTAINING PRODUCT ANALYSIS SAMPLES .6 Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:36:13 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AIR4127 - 2 - 1
9、. SCOPE This document, as referenced in the applicable product specifications in procurement documents, contains: a. A catalog of the standard carbon steels, alloy steels (including H-steels), and stainless and heat-resisting steels that are designated by chemical composition, or (for H-steels) by c
10、hemical composition and hardenability limits by reference to standard industry documents. b. Rules for designating the chemical content of carbon steels, alloy steels, and stainless and heat-resisting steels that are not classified as standard. 2. CLASSIFICATION AND DESIGNATION OF STEELS BY CHEMICAL
11、 COMPOSITION 2.1 Classification Chemical composition indicates only one aspect of a steel product and is not to be considered as a complete guide to quality and performance. Chemical composition, however, is the most common basis for the classification and designation of steels. The precise chemical
12、 content, together with the desired form (bar, sheet, strip, plate, etc.) and the size (primarily cross-sectional area or diameter, will determine whether a given product can be obtained simply by ordering a standard steel, or whether all the requirements must be specified in detail. 2.2 Standard St
13、eels Standard steels have specified compositions and are limited to particular forms and sizes. These steels have individual numerical designations assigned by industry to facilitate ordering, as shown in Table 1. The numbers are for identification and are not indicative of quality. The steel number
14、s used in this document are generally Unified Numbering System (UNS) numbers; Society of Automotive Engineers (SAE) numbers are included for further information. In general, standard steels are used more often and are more readily available than other compositions. 2.3 Former Standard Steels These s
15、teels were formerly listed as “standard steels” in previous editions of this document, the AISI manuals, and SAE Surface Vehicle Standards, but, because of decreased usage, they have been placed in separate tables in the referenced documents and in SAE Surface Vehicle Standard J1249. 2.4 Nonstandard
16、 Steels Nonstandard steels are steels that do not fall into the category of standard steels because of differences in their composition. These unlisted steels must be ordered by specifying the chemical content in accordance with established ranges and limits. 2.5 H-Steels A number of alloy steels, i
17、dentified by the prefix or suffix letter “H” to the steel number, may be designated by a combination of hardenability and composition. The hardenability data compiled for each of these steels, have been derived from extensive standard (Jominy) end-quench hardenability testing, and have been incorpor
18、ated into composite graphs. Each graph has two curves, plotted from the maximum and minimum hardness values reported for 1/16-inch distances from the quenched end of a standard 1-inch diameter specimen. The band created by these two curves defines the hardness limits for that composition. Hardenabil
19、ity bands and directions for their use in specifying H-steels are explained in 7.2. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:36:13 MSTNo reproduction or networking permitted without license from IHS -,-,- S
20、AE AIR4127 - 3 - 2.5.1 Chemical Composition Limits The chemical composition limits of the H-steels have been modified somewhat from the ranges or limits applicable to the same grades when specified by chemical composition only so that steel producers will be able to meet a common standard of hardena
21、bility limits. The modifications permit adjustments in manufacturing range of chemical composition to correct for individual plant melting characteristics which might otherwise influence the levels and widths of the hardenability bands. The modifications are not great enough to influence the general
22、 characteristics of the original compositions of the series under consideration. 3. VERIFICATION OF CHEMICAL COMPOSITION 3.1 Definitions 3.1.1 Cast or Heat Analysis Cast or heat analysis is the determination of the chemical composition of a melt, blow, or heat of steel as represented by samples obta
23、ined from the first part or middle part of the heat during pouring of the steel from a ladle. This analysis is representative of the product of a heat of steel as delivered and as reported to the purchaser. 3.1.2 Product Analysis Product analysis is a chemical analysis of steel in the semifinished o
24、r finished product form. The steel can be subjected to product analysis by the purchaser either for the purpose of verifying that the chemical composition is within specified limits for each element, including applicable tolerance for product analysis, or to determine variation in composition within
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